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Week 4 Reflection_Cells.docx

Week 4 Reflection_Cells.docx - Answers to the following...

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Answers to the following questions: 1. What types of things can and cannot pass through the lipid bilayer, not considering the use of proteins? WHY? 2. What is osmosis and how does it work? 3. What are the differences between hypotonic, hypertonic and isotonic solutions? Week 4 Reflection: Cells 1. The Transport of Molecules Across a Membrane May Be Active or Passive. As discussed in Chapter 3, some molecules can pass through cell membranes because they dissolve in the lipid bilayer. Such molecules are called lipophilic molecules . The steroid hormones provide a physiological example. These cholesterol relatives can pass through a membrane in their path of movement, but what determines the direction in which they will move? Such molecules will pass through a membrane located down their concentration gradient in a process called simple diffusion. In accord with the Second Law of Thermodynamics, molecules spontaneously move from a region of higher concentration to one of lower concentration. Thus, in this case, an entropy increase
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